Electric motor, handle and electric toothbrush
By setting a bearing module and a limit module on the motor shaft of the electric toothbrush, the problem of jamming when the motor shaft drives the brush head to move is solved, and the smooth movement of the motor shaft is achieved, improving the brushing experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU STARS PULSE CO LTD
- Filing Date
- 2025-06-18
- Publication Date
- 2026-07-21
AI Technical Summary
When the motor shaft of an electric toothbrush drives the brush head to move back and forth, it is prone to jamming, which affects the brushing experience.
By setting a bearing module, a drive module, and a limit module on the motor shaft, and utilizing the cooperation of the first bearing outer sleeve, the first sliding sleeve, and the limit assembly, the sliding sleeve is prevented from coming off, ensuring smooth movement of the motor shaft.
This achieves smooth reciprocating movement of the motor shaft, avoiding jamming and improving the brushing experience of the electric toothbrush.
Smart Images
Figure CN224537946U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electric toothbrush technology, and more particularly to a motor, handle, and electric toothbrush. Background Technology
[0002] Electric toothbrushes have become increasingly popular with consumers in recent years due to their ease of use and ability to clean teeth effectively.
[0003] In related technologies, the motor shaft of an electric toothbrush usually extends out of the extension hole on the housing and connects to the brush head. In addition to driving the brush head to rotate around the axis of the motor shaft, a new type of electric toothbrush has emerged in recent years that can drive the brush head to move back and forth along the axis of the motor shaft. This type of electric toothbrush can further improve the brushing experience of electric toothbrushes.
[0004] However, when the motor shaft drives the brush head to move back and forth along the axis of the motor shaft, it is easy for it to get stuck, which makes the back and forth movement of the motor shaft not smooth enough and affects the brushing experience of the electric toothbrush. Utility Model Content
[0005] This application discloses a motor, a handle, and an electric toothbrush, which enable the motor shaft to move back and forth smoothly, resulting in a better brushing experience.
[0006] To achieve the above objectives, in a first aspect, this application discloses an electric motor, comprising:
[0007] Motor shaft;
[0008] The bearing module includes a first bearing assembly, which includes a first bearing outer sleeve and a first sliding sleeve. The first sliding sleeve is sleeved on the motor shaft, and the first bearing outer sleeve is slidably sleeved on the first sliding sleeve along the axis of the motor shaft.
[0009] A drive module, the drive module being used to drive the motor shaft to reciprocate along the axis of the motor shaft; and,
[0010] The limiting module includes a first limiting component for preventing the first sliding sleeve from dislodging from the first bearing outer sleeve along the axis of the motor shaft.
[0011] When this motor is used in an electric toothbrush, and the brush head needs to be moved back and forth along the axis of the motor shaft to brush teeth, the first sliding sleeve is fitted onto the motor shaft, and the first bearing sleeve is slidably fitted onto the first sliding sleeve along the axis of the motor shaft. The motor shaft is used to connect with the brush head. Therefore, under the combined action of the first bearing sleeve, the first sliding sleeve, and the motor shaft, that is, under the support of the first bearing sleeve and the first sliding sleeve on the motor shaft, the structure will support the motor shaft to move back and forth relative to the housing along the axis of the motor shaft.
[0012] Based on this, the drive module can drive the motor shaft to reciprocate along the axis of the motor shaft, thereby enabling the brush head connected to the motor shaft to reciprocate along the axis of the motor shaft for brushing teeth.
[0013] Since the first sliding sleeve is fitted onto the motor shaft, and the first bearing outer sleeve is slidably fitted onto the first sliding sleeve along the axis of the motor shaft, when the drive module drives the motor shaft to reciprocate along the axis of the motor shaft, the first sliding sleeve may follow the motor shaft and reciprocate relative to the first bearing outer sleeve along the axis of the motor shaft. When the first sliding sleeve reciprocates relative to the first bearing outer sleeve along the axis of the motor shaft, the first sliding sleeve may directly detach from the first bearing outer sleeve.
[0014] When the first sliding sleeve comes off directly from the first bearing outer sleeve, the supporting effect of the structure jointly constructed by the first bearing outer sleeve and the first sliding sleeve on the motor shaft will disappear. Under this condition, when the drive module continues to drive the motor shaft to reciprocate along the axis of the motor shaft, the first sliding sleeve will collide with the first bearing outer sleeve, causing the motor shaft to jam when reciprocating along the axis of the motor shaft, affecting the brushing experience of the electric toothbrush.
[0015] In view of this, by setting a first limiting component, the first sliding sleeve can be prevented from dislodging from the first bearing sleeve along the axis of the motor shaft. In this way, the supporting effect of the structure jointly constructed by the first bearing sleeve and the first sliding sleeve on the motor shaft can be avoided, thereby making the reciprocating movement of the motor shaft smoother when the drive module drives the motor shaft to move back and forth along the axis of the motor shaft, without any jamming, resulting in a better brushing experience for the electric toothbrush.
[0016] Optionally, the first limiting component is located on both sides of the first bearing sleeve along the axis of the motor shaft, and is used to prevent the first sliding sleeve from dislodging from the first bearing sleeve along the axis of the motor shaft from both sides of the first bearing sleeve.
[0017] Since the first limiting component is located on both sides of the first bearing sleeve along the axis of the motor shaft, the first limiting component can prevent the first sliding sleeve from coming off the first side of the first bearing sleeve along the axis of the motor shaft, and also prevent the first sliding sleeve from coming off the second side of the first bearing sleeve opposite to the first side along the axis of the motor shaft. This can better avoid jamming when the drive module drives the motor shaft to move back and forth along the axis of the motor shaft.
[0018] Optionally, the first sliding sleeve is provided with balls, and the first limiting component is used to prevent the balls from coming out of the first bearing sleeve along the axis of the motor shaft from both sides of the first bearing sleeve.
[0019] When the ball comes out of the first bearing sleeve along the axis of the motor shaft, the ball will change its position relative to the first sliding sleeve due to the loss of the support of the first bearing sleeve. At this time, even if the overall structure of the first sliding sleeve has not yet come out of the first bearing sleeve, when the ball comes out of the first bearing sleeve along the axis of the motor shaft, there may still be a jamming situation when the ball needs to re-enter the first bearing sleeve along the axis of the motor shaft. Based on this, by preventing the ball from coming out of the first bearing sleeve along the axis of the motor shaft from both sides, the jamming situation can be further better avoided.
[0020] Optionally, the first limiting component includes:
[0021] The first limiting member has a first baffle wall located on the first side of the first bearing outer sleeve along the axis of the motor shaft. The first baffle wall and the first bearing outer sleeve are spaced apart along the axis of the motor shaft. The length of the first sliding sleeve along the axis of the motor shaft is H1, and the distance between the first baffle wall and the first bearing outer sleeve is H2. The first baffle wall is used to prevent the first sliding sleeve from dislodging from the first side of the first bearing outer sleeve along the axis of the motor shaft.
[0022] Since H1 is greater than H2, even if the first sliding sleeve slides along the axis of the motor shaft relative to the first bearing sleeve toward the first side until it abuts against the first retaining wall, at least part of the first sliding sleeve will still be inside the first bearing sleeve. In this way, the situation where the first sliding sleeve comes out of the first bearing sleeve along the axis of the motor shaft can be avoided, and the situation of jamming can be avoided when the drive module drives the motor shaft to move back and forth along the axis of the motor shaft.
[0023] Since the first limiting member has a first retaining wall located on the first side of the first bearing outer sleeve along the axis of the motor shaft, when the first sliding sleeve slides to abut against the first retaining wall, the first retaining wall will prevent the first sliding sleeve from continuing to move, thereby preventing the first sliding sleeve from coming off the first side of the first bearing outer sleeve along the axis of the motor shaft. The principle is simple and the manufacturing cost of the first retaining wall is also low. Therefore, the cost of the first limiting component can be reduced to a certain extent.
[0024] Optionally, the first retaining wall is provided with a countersunk hole extending along the axis of the motor shaft, the diameter of which is greater than the inner diameter of the first sliding sleeve and smaller than the outer diameter of the first sliding sleeve.
[0025] By making the diameter of the countersunk hole larger than the inner diameter of the first sliding sleeve and smaller than the outer diameter of the first sliding sleeve, it can be ensured that after the countersunk hole is set in the first retaining wall, when the first sliding sleeve approaches the first retaining wall along the axis of the motor shaft, part of the structure of the first sliding sleeve can still abut against the first retaining wall. This allows the first retaining wall to still prevent the first sliding sleeve from dislodging from the first bearing sleeve along the axis of the motor shaft. At the same time, the countersunk hole also allows the motor shaft to extend into the countersunk hole along the axis of the motor shaft. That is, when the countersunk hole is set in the first retaining wall, the first retaining wall can prevent the first sliding sleeve from dislodging from the first bearing sleeve along the axis of the motor shaft, while the first retaining wall will not affect the movement of the motor shaft along the axis of the motor shaft. Therefore, when the countersunk hole is set in the first retaining wall, the situation where the first retaining wall affects the movement of the motor shaft along the axis of the motor shaft can be avoided.
[0026] Optionally, the countersunk hole is a blind hole.
[0027] When the countersunk hole is a blind hole, on the one hand, it can prevent external dust from entering the inner cavity through the countersunk hole, thereby extending the service life of the handle. On the other hand, it can also prevent the motor shaft from protruding outside the housing through the countersunk hole, thereby preventing the motor shaft from puncturing the user and making the handle safer to use.
[0028] Optionally, the first barrier is formed within the housing of the handle of the electric toothbrush, the housing including a first end cap located at one end of the housing along the axis of the motor shaft, the first barrier being formed in the first end cap.
[0029] By forming the first retaining wall on the first end cap, the first retaining wall can be directly integrated onto the first end cap. In this way, there is no need to process a separate first limiting component to form the first retaining wall. Instead, the first retaining wall can be directly made on the first end cap. Therefore, the number of parts of the handle can be reduced, the cost of the handle can be reduced, and at the same time, the assembly process of the handle can be simplified and the assembly efficiency of the handle can be improved.
[0030] Optionally, the first limiting component further includes:
[0031] The second limiting member is sleeved on the motor shaft. The second limiting member has a second retaining wall located on the second side of the first bearing outer sleeve along the axis of the motor shaft. The second side is opposite to the first side. The second retaining wall is used to prevent the first sliding sleeve from dislodging from the first bearing outer sleeve along the axis of the motor shaft from the second side.
[0032] Since the second limiting member is sleeved on the motor shaft, and the second limiting member has a second retaining wall located on the second side of the first bearing outer sleeve along the axis of the motor shaft, the second retaining wall can prevent the first sliding sleeve from coming off the first bearing outer sleeve from the second side along the axis of the motor shaft, thereby better avoiding jamming when the drive module drives the motor shaft to reciprocate along the axis of the motor shaft.
[0033] Since the second limiting member has a second retaining wall located on the second side of the first bearing outer sleeve along the axis of the motor shaft, when the first sliding sleeve slides to abut against the second retaining wall, the second retaining wall will prevent the first sliding sleeve from continuing to move, thereby preventing the first sliding sleeve from coming out of the first bearing outer sleeve along the axis of the motor shaft from the second side. The principle is simple and the manufacturing cost of the second retaining wall is also low. Therefore, the cost of the second limiting member can be reduced to a certain extent.
[0034] Optionally, the second retaining wall is provided with a convex ring surrounding the motor shaft on the side facing the first sliding sleeve, the outer diameter of the convex ring being larger than the inner diameter of the first sliding sleeve and smaller than the outer diameter of the first sliding sleeve.
[0035] By making the outer diameter of the convex ring larger than the inner diameter of the first sliding sleeve and smaller than the outer diameter of the first sliding sleeve, the convex ring can enter the first bearing sleeve without colliding with it as the motor shaft drives the second limiting member to move towards the first bearing sleeve along the axis of the motor shaft.
[0036] Optionally, during the reciprocating movement of the second limiting member along the axis of the motor shaft, the maximum distance H3 between the convex ring and the first bearing outer sleeve is less than the length H1 of the first sliding sleeve along the axis of the motor shaft.
[0037] By ensuring that the maximum distance H3 between the convex ring and the first bearing outer sleeve is less than the length H1 of the first sliding sleeve along the axis of the motor shaft, even if the second limiting member moves to the furthest distance away from the first bearing outer sleeve along the axis of the motor shaft, and the first sliding sleeve slides along the motor shaft, a portion of the first sliding sleeve will still be located inside the first bearing outer sleeve. In this way, the situation where the first sliding sleeve comes out of the first bearing outer sleeve from the second side along the axis of the motor shaft can be avoided, thereby preventing jamming when the drive module drives the motor shaft to reciprocate along the axis of the motor shaft.
[0038] Optionally, the second limiting member is provided with a sound-absorbing pad.
[0039] When a sound-absorbing pad is provided on the second limiting member, the sound-absorbing pad can prevent rigid collision between the second limiting member and the first bearing outer sleeve, and can absorb the vibration and noise generated when the second limiting member and the first bearing outer sleeve collide. In this way, on the one hand, it can prevent noise from occurring after the second limiting member and the first bearing outer sleeve collide, and on the other hand, it can also prevent one or both of the second limiting member and the first bearing outer sleeve from being damaged.
[0040] Optionally, the second retaining wall is provided with a convex ring surrounding the motor shaft on the side facing the first sliding sleeve, and the noise-absorbing pad surrounds the convex ring and the convex ring protrudes from the noise-absorbing pad along the axis of the motor shaft.
[0041] By having the silencing pad surround the convex ring, with the convex ring protruding from the silencing pad along the axis of the motor shaft, the convex ring serves two purposes. First, it allows the silencing pad to be fitted onto it, making the placement of the silencing pad on the second retaining wall more precise and secure. Second, it allows the convex ring to be inserted into the first bearing sleeve when the silencing pad abuts against it. The fit between the convex ring and the inner circumferential wall of the first bearing sleeve also provides some guidance, making the motor shaft move more smoothly and stably along its axis.
[0042] Optionally, the second limiting member is used to be disposed in the housing of the handle of the electric toothbrush, and the drive module is also used to drive the motor shaft to rotate around the axis of the motor shaft, and the first sliding sleeve is also rotatably inserted into the first bearing sleeve around the axis of the motor shaft.
[0043] The second limiting member has a set of stop teeth arranged circumferentially along the motor shaft, and the housing has a stop groove corresponding to the stop teeth, with the stop teeth located in the stop groove;
[0044] Along the circumferential direction of the motor shaft, the size of the retaining tooth is smaller than the size of the retaining groove.
[0045] By forming stop teeth arranged circumferentially along the motor shaft on the second limiting member, and providing corresponding grooves on the housing, the stop teeth are located within the grooves. The size of the stop teeth is smaller than the size of the grooves circumferentially along the motor shaft, ensuring that the stop teeth can only rotate within a limited range relative to the grooves along the motor shaft. In simpler terms, when the stop teeth rotate too much circumferentially along the motor shaft, the groove wall will prevent further rotation. This avoids the motor shaft from rotating 360° circumferentially relative to the housing under external force, thus preventing damage to the handle due to excessive rotation.
[0046] Optionally, there are multiple teeth and multiple grooves, with each tooth corresponding to one groove.
[0047] By having multiple stop teeth and multiple stop grooves, the corresponding stop teeth can be limited by the groove walls of multiple stop grooves, so that each stop tooth can only rotate within a limited range. This can better prevent the motor shaft from rotating 360° around the motor shaft relative to the housing under the action of external force.
[0048] Optionally, the housing includes a first end cap located at one end of the housing along the axis of the motor shaft, and the retaining groove is formed in the first end cap.
[0049] By forming the retaining groove on the first end cap, the retaining groove can be directly integrated onto the first end cap. In this way, there is no need to process a separate part to form the retaining groove. Instead, the retaining groove is made directly on the first end cap. Therefore, the number of handle parts can be reduced, the cost of the handle can be reduced, and at the same time, the assembly process of the handle can be simplified and the assembly efficiency of the handle can be improved.
[0050] Optionally, the bearing module further includes:
[0051] The second bearing assembly includes a second bearing outer sleeve and a second sliding sleeve. The second sliding sleeve is sleeved on the motor shaft, and the second bearing outer sleeve is slidably sleeved on the second sliding sleeve along the axis of the motor shaft.
[0052] The second bearing outer sleeve and the first bearing outer sleeve are spaced apart along the axis of the motor shaft.
[0053] Since the second bearing sleeve and the first bearing sleeve are spaced apart along the axis of the motor shaft, the first bearing assembly and the second bearing assembly can support the motor shaft from both ends of the housing. Therefore, the motor shaft can move back and forth along the axis of the motor shaft or rotate around the axis of the motor shaft more smoothly, steadily and stably.
[0054] Optionally, the motor shaft includes a first shaft segment and a second shaft segment, the first sliding sleeve is sleeved on the first shaft segment, and the second shaft segment is used to connect with the brush head;
[0055] The diameter of the first shaft segment is larger than the diameter of the second shaft segment.
[0056] Since the diameter of the first shaft segment is larger than the diameter of the second shaft segment, the motor shaft will be a stepped shaft.
[0057] When the motor shaft is a stepped shaft and the diameter of the first shaft segment is larger than the diameter of the second shaft segment, if the accuracy of the first shaft segment is found to be insufficient during the installation of the first bearing assembly and the second bearing assembly on the first shaft segment, the diameter of the first shaft segment will not become too small after fine grinding, thus ensuring that the mechanical strength of the motor shaft formed by the first shaft segment and the second shaft segment is strong.
[0058] In the process of manufacturing the motor shaft, the motor shaft can first be electroplated. Then, if it is found that the precision of the first shaft section does not meet the precision requirements, only the first shaft section can be finely ground, and the second shaft section can be left unpolished. In this way, the installation precision of the first bearing assembly and the second bearing assembly on the first shaft section can be guaranteed, while the salt spray resistance of the second shaft section can be guaranteed.
[0059] Secondly, this application discloses a handle, comprising:
[0060] A housing, wherein the housing has an extension hole communicating with the inner cavity of the housing; and,
[0061] In any of the motors described in the first aspect above, the bearing module, the drive module, and the limiting module are all located in the inner cavity. The first bearing sleeve is fixed in the inner cavity and extends along the axis of the motor shaft. At least a portion of the motor shaft extends out of the housing through the extension hole for connection with the brush head.
[0062] Because a motor can prevent jamming when the motor shaft moves back and forth along the axis of the motor shaft, the user experience of the handle can be improved when the handle includes a motor.
[0063] Thirdly, this application discloses an electric toothbrush, comprising:
[0064] The handle described in any of the second aspects above;
[0065] A brush head, which is connected to the motor shaft.
[0066] Because the handle allows for smoother reciprocating movement of the motor shaft without any jamming, the inclusion of a handle in an electric toothbrush enhances the brushing experience.
[0067] Compared with the prior art, the beneficial effects of this application are as follows:
[0068] In this application, when the motor is applied to an electric toothbrush, and the brush head needs to be moved back and forth along the axis of the motor shaft to brush teeth, since the first sliding sleeve is sleeved on the motor shaft, and the first bearing sleeve is slidably sleeved on the first sliding sleeve along the axis of the motor shaft, and the motor shaft is used to connect with the brush head, the cooperation of the first bearing sleeve, the first sliding sleeve, and the motor shaft, that is, the support of the first bearing sleeve and the first sliding sleeve on the motor shaft, will structurally support the motor shaft to move back and forth relative to the housing along the axis of the motor shaft.
[0069] Based on this, the drive module can drive the motor shaft to reciprocate along the axis of the motor shaft, thereby enabling the brush head connected to the motor shaft to reciprocate along the axis of the motor shaft for brushing teeth.
[0070] Since the first sliding sleeve is fitted onto the motor shaft, and the first bearing outer sleeve is slidably fitted onto the first sliding sleeve along the axis of the motor shaft, when the drive module drives the motor shaft to reciprocate along the axis of the motor shaft, the first sliding sleeve may follow the motor shaft and reciprocate relative to the first bearing outer sleeve along the axis of the motor shaft. When the first sliding sleeve reciprocates relative to the first bearing outer sleeve along the axis of the motor shaft, the first sliding sleeve may directly detach from the first bearing outer sleeve.
[0071] When the first sliding sleeve comes off directly from the first bearing outer sleeve, the supporting effect of the structure jointly constructed by the first bearing outer sleeve and the first sliding sleeve on the motor shaft will disappear. Under this condition, when the drive module continues to drive the motor shaft to reciprocate along the axis of the motor shaft, the first sliding sleeve will collide with the first bearing outer sleeve, causing the motor shaft to jam when reciprocating along the axis of the motor shaft, affecting the brushing experience of the electric toothbrush.
[0072] In view of this, by setting a first limiting component, the first sliding sleeve can be prevented from dislodging from the first bearing sleeve along the axis of the motor shaft. In this way, the supporting effect of the structure jointly constructed by the first bearing sleeve and the first sliding sleeve on the motor shaft can be avoided, thereby making the reciprocating movement of the motor shaft smoother when the drive module drives the motor shaft to move back and forth along the axis of the motor shaft, without any jamming, resulting in a better brushing experience for the electric toothbrush. Attached Figure Description
[0073] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0074] Figure 1 This is a schematic diagram of the structure of an electric motor provided in one embodiment of this application;
[0075] Figure 2A This is a schematic diagram of the structure of a handle provided in one embodiment of this application;
[0076] Figure 2B yes Figure 2A A schematic diagram of the handle from another perspective;
[0077] Figure 3 yes Figure 2B A cross-sectional view of the handle at position AA;
[0078] Figure 4 yes Figure 2A An exploded view of the middle handle;
[0079] Figure 5 yes Figure 3 A schematic diagram of a structure of the first bearing assembly in the middle;
[0080] Figure 6 yes Figure 5 An exploded view of the first bearing assembly in the middle;
[0081] Figure 7 yes Figure 2A A schematic diagram of the structure of the handle when applied to an electric toothbrush;
[0082] Figure 8 yes Figure 2A Exploded view of some structures of the middle handle;
[0083] Figure 9 yes Figure 4 Schematic diagram of the structure of the second limiting component;
[0084] Figure 10 This is a schematic diagram of the structure when the first bearing assembly and the second bearing assembly are installed on the motor shaft.
[0085] Explanation of main figure symbols
[0086] 1-Housing; 11-Inner cavity; 12-Extension hole; 13-First end cover; 14-Slot;
[0087] 2-Bearing module; 21-First bearing assembly; 211-First bearing outer sleeve; 212-First sliding sleeve; 2121-Ball; 22-Second bearing assembly; 221-Second bearing outer sleeve; 222-Second sliding sleeve;
[0088] 3-Motor shaft; 31-First shaft section; 32-Second shaft section;
[0089] 4-Driver module;
[0090] 5-Limiting module; 51-First limiting component; 511-First limiting piece; 5111-First retaining wall; 5111a-Counterhead; 512-Second limiting piece; 5121-Second retaining wall; 5121a-Protruding ring; 5121b-Silence pad; 5122-Stop tooth; 52-Second limiting component;
[0091] 100 - Handle; 200 - Brush head; 300 - Motor; 1000 - Electric toothbrush. Detailed Implementation
[0092] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0093] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0094] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0095] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0096] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.
[0097] Before explaining the technical solution of this application, the background technology of this application shall be explained first.
[0098] Electric toothbrushes have become increasingly popular with consumers in recent years due to their ease of use and ability to clean teeth effectively.
[0099] In related technologies, the motor shaft of an electric toothbrush usually extends out of the extension hole on the housing and connects to the brush head. In addition to driving the brush head to rotate around the axis of the motor shaft, a new type of electric toothbrush has emerged in recent years that can drive the brush head to move up and down along the axis of the motor shaft. This type of electric toothbrush can further improve the brushing experience of electric toothbrushes.
[0100] However, when the motor shaft drives the brush head to move up and down along the axis of the motor shaft, it is easy for it to get stuck, resulting in an uneven up-and-down movement of the motor shaft and affecting the brushing experience of the electric toothbrush. Therefore, this application provides a new handle 100 to solve the above problems.
[0101] The technical solution of this application will be described below with reference to specific embodiments and accompanying drawings.
[0102] Figure 1 This is a schematic diagram of the structure of an electric motor provided in one embodiment of this application; Figure 2A This is a schematic diagram of the structure of a handle 100 provided in one embodiment of this application. Figure 2B yes Figure 2A A structural schematic diagram of the handle 100 from another perspective. Figure 3 yes Figure 2B A cross-sectional view of handle 100 at position AA.
[0103] See Figure 1 , Figure 2A , Figure 2B and Figure 3 The motor 300 includes a bearing module 2, a motor shaft 3, a drive module 4, and a limit module 5.
[0104] See Figure 3 , Figure 4 and Figure 5 , Figure 4 yes Figure 2A An exploded view of the middle handle 100. Figure 5 yes Figure 3 A schematic diagram of the structure of the first bearing assembly 21, wherein the bearing module 2 includes the first bearing assembly 21, see [reference]. Figure 3 , Figure 5 and Figure 6 , Figure 6 yes Figure 5An exploded view of the first bearing assembly 21, which includes a first bearing outer sleeve 211 and a first sliding sleeve 212. The first sliding sleeve 212 is sleeved on the motor shaft 3, and the first bearing outer sleeve 211 is along the axis of the motor shaft 3. Figure 3 It is slidably sleeved on the first sliding sleeve 212 in the X-axis direction.
[0105] See Figure 7 , Figure 7 yes Figure 2A The schematic diagram shows the structure of the handle 100 when applied to the electric toothbrush 1000. The motor shaft 3 is used to connect to the brush head 200. (See attached diagram.) Figure 3 and Figure 4 The drive module 4 is disposed in the inner cavity 11 and is used to drive the motor shaft 3 to reciprocate along the axis of the motor shaft 3. The limiting module 5 includes a first limiting component 51, which is used to prevent the first sliding sleeve 212 from coming out of the first bearing outer sleeve 211 along the axis of the motor shaft 3.
[0106] In this embodiment, when the motor 300 is applied to the electric toothbrush 1000, and the brush head 200 needs to be moved back and forth along the axis of the motor shaft 3 to brush teeth, the first sliding sleeve 212 is sleeved on the motor shaft 3, and the first bearing sleeve 211 moves along the axis of the motor shaft 3 ( Figure 3 The motor shaft 3 is slidably fitted onto the first sliding sleeve 212 in the X-axis direction. The motor shaft 3 is used to connect with the brush head 200. Therefore, under the combined action of the first bearing sleeve 211, the first sliding sleeve 212 and the motor shaft 3, that is, under the support of the first bearing sleeve 211 and the first sliding sleeve 212 on the motor shaft 3, the structure will support the motor shaft 3 to reciprocate relative to the housing 1 along the axis of the motor shaft 3.
[0107] Based on this, the drive module 4 can drive the motor shaft 3 to reciprocate along the axis of the motor shaft 3, thereby enabling the brush head 200 connected to the motor shaft 3 to reciprocate along the axis of the motor shaft 3 for brushing teeth.
[0108] Among them, since the first sliding sleeve 212 is sleeved on the motor shaft 3, the first bearing outer sleeve 211 is along the axis of the motor shaft 3 ( Figure 3 The first sliding sleeve 212 is slidably fitted onto the first sliding sleeve 212 in the X-axis direction. Therefore, when the drive module 4 drives the motor shaft 3 to reciprocate along the axis of the motor shaft 3, the first sliding sleeve 212 may follow the motor shaft 3 to reciprocate relative to the first bearing outer sleeve 211 along the axis of the motor shaft 3. When the first sliding sleeve 212 reciprocates relative to the first bearing outer sleeve 211 along the axis of the motor shaft 3, the first sliding sleeve 212 may directly detach from the first bearing outer sleeve 211.
[0109] When the first sliding sleeve 212 comes off directly from the first bearing outer sleeve 211, the supporting effect of the structure jointly constructed by the first bearing outer sleeve 211 and the first sliding sleeve 212 on the motor shaft 3 will disappear. Under this condition, when the drive module 4 continues to drive the motor shaft 3 to reciprocate along the axis of the motor shaft 3, the first sliding sleeve 212 will collide with the first bearing outer sleeve 211, causing the motor shaft 3 to jam when reciprocating along the axis of the motor shaft 3, affecting the brushing experience of the electric toothbrush.
[0110] Considering this, by setting the first limiting component 51, the first sliding sleeve 212 can be prevented from dislodging from the first bearing outer sleeve 211 along the axis of the motor shaft 3. In this way, the supporting effect of the structure jointly constructed by the first bearing outer sleeve 211 and the first sliding sleeve 212 on the motor shaft 3 can be avoided. As a result, when the drive module 4 drives the motor shaft 3 to move back and forth along the axis of the motor shaft 3, the reciprocating movement of the motor shaft 3 is relatively smooth and there will be no jamming, which makes the brushing experience of the electric toothbrush better.
[0111] It should be noted that the aforementioned drive module 4 may include a stator and a mover. The mover may be fixedly mounted on the motor shaft 3, and the stator may be mounted inside the inner cavity 11 and surround the mover. In this way, the stator can drive the mover to reciprocate along the axis of the motor shaft 3, thereby achieving the purpose of driving the motor shaft 3 to reciprocate along the axis of the motor shaft 3.
[0112] In some embodiments, see Figure 3 The first limiting component 51 is along the axis of the motor shaft 3 ( Figure 3 (in the X-axis direction) located on both sides of the first bearing outer sleeve 211 ( Figure 3 (on the left and right sides), used to prevent the first sliding sleeve 212 from coming off the first bearing outer sleeve 211 along the axis of the motor shaft 3 from both sides of the first bearing outer sleeve 211.
[0113] Since the first limiting component 51 is located on both sides of the first bearing sleeve 211 along the axis of the motor shaft 3, the first limiting component 51 can prevent the first sliding sleeve 212 from exiting from the first side of the first bearing sleeve 211 along the axis of the motor shaft 3. Figure 3 The first bearing sleeve 212 can also be prevented from coming off from the second side (opposite to the first side) of the first bearing sleeve 211 along the axis of the motor shaft 3. Figure 3 The right side of the first bearing outer sleeve 211 is dislodged, which can better avoid jamming when the drive module 4 drives the motor shaft 3 to move back and forth along the axis of the motor shaft 3.
[0114] Further, see Figure 3In some embodiments, a ball bearing 2121 is provided inside the first sliding sleeve 212, and the first limiting component 51 is used to prevent the ball bearing 2121 from coming out of the first bearing sleeve 211 along the axis of the motor shaft 3 from both sides of the first bearing sleeve 211.
[0115] When the ball bearing 2121 comes out of the first bearing sleeve 211 along the axis of the motor shaft 3, the position of the ball bearing 2121 relative to the first sliding sleeve 212 will change due to the loss of the support of the first bearing sleeve 211. At this time, even if the overall structure of the first sliding sleeve 212 has not yet come out of the first bearing sleeve 211, when the ball bearing 2121 has come out of the first bearing sleeve 211 along the axis of the motor shaft 3, there may still be a jamming situation when the ball bearing 2121 needs to re-enter the first bearing sleeve 211 along the axis of the motor shaft 3. Based on this, by preventing the ball bearing 2121 from coming out of the first bearing sleeve 211 along the axis of the motor shaft 3 from both sides of the first bearing sleeve 211, the jamming situation can be further better avoided.
[0116] There are multiple ways to implement the first limiting component 51 mentioned above. In one possible implementation, see [link to relevant documentation]. Figure 3 and Figure 8 , Figure 8 yes Figure 2A An exploded view of a portion of the structure of the handle 100 shows that the first limiting component 51 includes a first limiting member 511. The first limiting member 511 has a first stop wall 5111 located on the first side of the first bearing sleeve 211 along the axis of the motor shaft 3. The first stop wall 5111 and the first bearing sleeve 211 are spaced apart along the axis of the motor shaft 3. The length of the first sliding sleeve 212 along the axis of the motor shaft 3 is H1, and the distance between the first stop wall 5111 and the first bearing sleeve 211 is H2, where H1 is greater than H2. The first stop wall 5111 is used to prevent the first sliding sleeve 212 from moving along the axis of the motor shaft 3 from the first side (…). Figure 3 The left side of the first bearing outer sleeve 211) is dislodged from the first bearing outer sleeve 211.
[0117] Since H1 is greater than H2, even if the first sliding sleeve 212 slides along the axis of the motor shaft 3 relative to the first bearing outer sleeve 211 towards the first side until it abuts against the first retaining wall 5111, at least part of the first sliding sleeve 212 will still be inside the first bearing outer sleeve 211. In this way, the situation where the first sliding sleeve 212 comes out of the first bearing outer sleeve 211 from the first side along the axis of the motor shaft 3 can be avoided, and the situation of jamming when the drive module 4 drives the motor shaft 3 to move back and forth along the axis of the motor shaft 3 can be avoided.
[0118] Since the first limiting member 511 has a first retaining wall 5111 located on the first side of the first bearing outer sleeve 211 along the axis of the motor shaft 3, when the first sliding sleeve 212 slides to abut against the first retaining wall 5111, the first retaining wall 5111 will prevent the first sliding sleeve 212 from continuing to move, thereby preventing the first sliding sleeve 212 from coming out of the first bearing outer sleeve 211 along the axis of the motor shaft 3. The principle is simple and the manufacturing cost of the first retaining wall 5111 is also low. Therefore, the cost of the first limiting component 51 can be reduced to a certain extent.
[0119] Of course, the first limiting component 51 can also be other possible structures, as long as it can prevent the first sliding sleeve 212 from coming off the first bearing outer sleeve 211 along the axis of the motor shaft 3. This embodiment does not limit the first limiting component 51.
[0120] For example, the first limiting component 51 can also be the winding frame included in the drive module 4. The limiting is achieved by the winding frame abutting against other components (such as the housing 1) in the handle 100, thereby preventing the first sliding sleeve 212 from coming off the first bearing outer sleeve 211 along the axis of the motor shaft 3. This embodiment does not limit the first limiting component 51.
[0121] In some embodiments, see Figure 3 and Figure 8 The first retaining wall 5111 is provided with a countersunk hole 5111a extending along the axis of the motor shaft 3. The diameter of the countersunk hole 5111a is larger than the inner diameter of the first sliding sleeve 212 and smaller than the outer diameter of the first sliding sleeve 212.
[0122] By making the diameter of the countersunk hole 5111a larger than the inner diameter of the first sliding sleeve 212 and smaller than the outer diameter of the first sliding sleeve 212, it can be ensured that after the countersunk hole 5111a is set on the first retaining wall 5111, when the first sliding sleeve 212 approaches the first retaining wall 5111 along the axis of the motor shaft 3, part of the structure of the first sliding sleeve 212 can still abut against the first retaining wall 5111, so that the first retaining wall 5111 can still play the role of preventing the first sliding sleeve 212 from coming out of the first bearing outer sleeve 211 along the axis of the motor shaft 3. At the same time, the countersunk hole 5111a can also allow the motor shaft 3 to penetrate into the countersunk hole 5111a along the axis of the motor shaft 3. That is, when the countersunk hole 5111a is provided on the first retaining wall 5111, the first retaining wall 5111 can prevent the first sliding sleeve 212 from coming off the first bearing outer sleeve 211 from the first side along the axis of the motor shaft 3. At the same time, the first retaining wall 5111 will not affect the movement of the motor shaft 3 along the axis of the motor shaft 3. Therefore, when the countersunk hole 5111a is provided on the first retaining wall 5111, the situation where the first retaining wall 5111 affects the movement of the motor shaft 3 along the axis of the motor shaft 3 can be avoided.
[0123] In some embodiments, see Figure 3 and Figure 8 The countersunk hole 5111a is a blind hole.
[0124] When the countersunk hole 5111a is a blind hole, on the one hand, it can prevent external dust from entering the inner cavity 11 through the countersunk hole 5111a, thereby extending the service life of the handle 100. On the other hand, it can also prevent the motor shaft 3 from protruding outside the housing 1 through the countersunk hole 5111a, thereby preventing the motor shaft 3 from puncturing the user and making the handle 100 safer to use.
[0125] In some embodiments, see Figure 3 and Figure 8 The first barrier 5111 is formed inside the housing 1 of the handle 100. The housing 1 includes a first end cover 13 located at one end of the housing 1 along the axis of the motor shaft 3. The first barrier 5111 is formed in the first end cover 13.
[0126] By forming the first retaining wall 5111 on the first end cap 13, the first retaining wall 5111 can be directly integrated onto the first end cap 13. In this way, there is no need to process a separate first limiting member 511 to form the first retaining wall 5111. Instead, the first retaining wall 5111 can be directly made on the first end cap 13. Therefore, the number of parts of the handle 100 can be reduced, the cost of the handle 100 can be reduced, and at the same time, the assembly process of the handle 100 can be simplified and the assembly efficiency of the handle 100 can be improved.
[0127] In some embodiments, see Figure 3 , Figure 4 and Figure 9 , Figure 9 yes Figure 4 A schematic diagram of the structure of the second limiting member 512 is shown. The first limiting assembly 51 also includes a second limiting member 512. The second limiting member 512 is sleeved on the motor shaft 3. The second limiting member 512 is located on the second side of the first bearing outer sleeve 211 along the axis of the motor shaft 3. Figure 3 The second retaining wall 5121 (on the right side of the first bearing sleeve 211) is opposite to the first side. The second retaining wall 5121 is used to prevent the first sliding sleeve 212 from coming off the first bearing sleeve 211 from the second side along the axis of the motor shaft 3.
[0128] Since the second limiting member 512 is sleeved on the motor shaft 3, and the second limiting member 512 has a second baffle 5121 located on the second side of the first bearing sleeve 211 along the axis of the motor shaft 3, the second baffle 5121 can prevent the first sliding sleeve 212 from coming off the first bearing sleeve 211 from the second side along the axis of the motor shaft 3, thereby better avoiding jamming when the drive module 4 drives the motor shaft 3 to reciprocate along the axis of the motor shaft 3.
[0129] Since the second limiting member 512 has a second retaining wall 5121 located on the second side of the first bearing outer sleeve 211 along the axis of the motor shaft 3, when the first sliding sleeve 212 slides to abut against the second retaining wall 5121, the second retaining wall 5121 will prevent the first sliding sleeve 212 from continuing to move, thereby preventing the first sliding sleeve 212 from coming out of the first bearing outer sleeve 211 along the axis of the motor shaft 3 from the second side. The principle is simple and the manufacturing cost of the second retaining wall 5121 is also low. Therefore, the cost of the second limiting member 512 can be reduced to a certain extent.
[0130] The specific way in which the second limiting member 512 is sleeved on the motor shaft 3 is as follows: the second limiting member 512 can be provided with a through hole, and the second limiting member 512 can be interference-fitted with the motor shaft 3 through the through hole. By controlling the interference amount, the frictional torque between the second limiting member 512 and the motor shaft 3 can be ensured, thereby ensuring that the second limiting member 512 can be stably fixed to the motor shaft 3.
[0131] In some embodiments, see Figure 3 and Figure 9 The second retaining wall 5121 has a convex ring 5121a surrounding the motor shaft 3 on the side facing the first sliding sleeve 212. The outer diameter of the convex ring 5121a is larger than the inner diameter of the first sliding sleeve 212 and smaller than the outer diameter of the first sliding sleeve 212.
[0132] By making the outer diameter of the convex ring 5121a larger than the inner diameter of the first sliding sleeve 212 and smaller than the outer diameter of the first sliding sleeve 212, when the motor shaft 3 drives the second limiting member 512 towards the direction closer to the first bearing outer sleeve 211 along the axis of the motor shaft 3 ( Figure 3 During the movement in the negative direction of the X-axis, the convex ring 5121a can enter the first bearing outer sleeve 211 without colliding with it.
[0133] In some embodiments, see Figure 3 During the process of the second limiting member 512 reciprocating along the axis of the motor shaft 3, the maximum distance H3 between the convex ring 5121a and the first bearing outer sleeve 211 is less than the length H1 of the first sliding sleeve 212 along the axis of the motor shaft 3.
[0134] By ensuring that the maximum distance H3 between the convex ring 5121a and the first bearing outer sleeve 211 is less than the length H1 of the first sliding sleeve 212 along the axis of the motor shaft 3, even if the second limiting member 512 moves to the furthest distance away from the first bearing outer sleeve 211 along the axis of the motor shaft 3, and the first sliding sleeve 212 slides along the motor shaft 3, a portion of the first sliding sleeve 212 will still be located inside the first bearing outer sleeve 211. This prevents the first sliding sleeve 212 from sliding along the axis of the motor shaft 3 from the second side (…). Figure 3 The right side of the first bearing outer sleeve 211 may come out of the first bearing outer sleeve 211, thus avoiding jamming when the drive module 4 drives the motor shaft 3 to move back and forth along the axis of the motor shaft 3.
[0135] To avoid noise caused by a collision between the second retaining wall 5121 and the first bearing sleeve 211, in some embodiments, see [reference needed]. Figure 3 and Figure 9 The second limiting member 512 is provided with a sound-absorbing pad 5121b.
[0136] When the second limiting member 512 is provided with a sound-absorbing pad 5121b, the sound-absorbing pad 5121b can prevent rigid collision between the second limiting member 512 and the first bearing outer sleeve 211, and can absorb the vibration and noise generated when the second limiting member 512 and the first bearing outer sleeve 211 collide. In this way, on the one hand, noise can be avoided after the second limiting member 512 and the first bearing outer sleeve 211 collide, and on the other hand, it can also prevent one or both of the second limiting member 512 and the first bearing outer sleeve 211 from being damaged.
[0137] Specifically, the sound-absorbing pad 5121b can be disposed on the second retaining wall 5121 of the second limiting member 512. Of course, it can also be disposed at other positions of the second limiting member 512. This embodiment does not limit this.
[0138] The aforementioned sound-absorbing pad 5121b can be a silicone pad, a rubber pad, or any other sound-absorbing pad that can prevent rigid collisions between the second retaining wall 5121 and the first bearing outer sleeve 211. This embodiment does not limit this.
[0139] In some embodiments, see Figure 3 and Figure 9 The noise-absorbing pad 5121b surrounds the convex ring 5121a, and the convex ring 5121a protrudes from the noise-absorbing pad 5121b along the axis of the motor shaft 3.
[0140] By having the silencing pad 5121b surround the convex ring 5121a, and the convex ring 5121a protruding from the silencing pad 5121b along the axis of the motor shaft 3, on the one hand, the convex ring 5121a can serve as a place for the silencing pad 5121b to be fitted onto it, making the placement of the silencing pad 5121b on the second retaining wall 5121 more precise and secure. On the other hand, when the silencing pad 5121b abuts against the first bearing outer sleeve 211, the convex ring 5121a can be inserted into the first bearing outer sleeve 211. The fit between the convex ring 5121a and the inner circumferential wall of the first bearing outer sleeve 211 can also play a guiding role to some extent, making the motor shaft 3 move more smoothly and stably along the axis of the motor shaft 3.
[0141] In some embodiments, see Figure 3 and Figure 4 The second limiting member 512 is used to be installed inside the housing 1 of the handle 100. The drive module 4 is also used to drive the motor shaft 3 to rotate around the axis of the motor shaft 3. The first sliding sleeve 212 is also rotatably inserted into the first bearing outer sleeve 211 around the axis of the motor shaft 3.
[0142] Since the first sliding sleeve 212 is also rotatably inserted into the first bearing outer sleeve 211 around the axis of the motor shaft 3, when the drive module 4 drives the motor shaft 3 to rotate around the axis of the motor shaft 3, the first sliding sleeve 212 can also rotate relative to the first bearing outer sleeve 211 around the axis of the motor shaft 3 to support the rotation of the motor shaft 3 around the axis of the motor shaft 3.
[0143] When the support motor shaft 3 rotates around the axis of the motor shaft 3, it can drive the brush head 200 connected to the motor shaft 3 to rotate around the axis of the motor shaft 3, so that the electric toothbrush 1000 can brush teeth by driving the brush head 200 to rotate around the axis of the motor shaft 3, making the brushing function more comprehensive.
[0144] In some embodiments, see Figure 4 and Figure 9 The second limiting member 512 has a stop tooth 5122 arranged in the circumferential direction along the motor shaft 3. The housing 1 is provided with a stop groove 14 corresponding to the stop tooth 5122. The stop tooth 5122 is located in the stop groove 14 in the circumferential direction along the motor shaft 3. The size of the stop tooth 5122 is smaller than the size of the stop groove 14.
[0145] By forming a stop tooth 5122 arranged circumferentially along the motor shaft 3 on the second limiting member 512, and providing a stop groove 14 corresponding to the stop tooth 5122 on the housing 1, the stop tooth 5122 is located in the stop groove 14, and the size of the stop tooth 5122 is smaller than the size of the stop groove 14 along the circumferential direction of the motor shaft 3. This allows the stop tooth 5122 to rotate only to a limited extent relative to the stop groove 14 along the circumferential direction of the motor shaft 3. In simpler terms, when the stop tooth 5122 rotates too much along the circumferential direction of the motor shaft 3, the groove wall of the stop groove 14 will prevent the stop tooth 5122 from continuing to rotate along the circumferential direction of the motor shaft 3. In this way, the situation where the motor shaft 3 rotates 360° relative to the housing 1 along the circumferential direction of the motor shaft 3 under the action of external force can be avoided, thereby preventing the handle 100 from being damaged due to the excessive rotation angle of the motor shaft 3.
[0146] In some embodiments, see Figure 4 and Figure 9 The number of the stop teeth 5122 and the number of the stop grooves 14 are both multiple, with each of the multiple stop teeth 5122 corresponding to one of the multiple stop grooves 14.
[0147] By making both the number of stop teeth 5122 and the number of stop grooves 14 multiple, the corresponding stop teeth 5122 can be limited by the groove walls of multiple stop grooves 14, so that each stop tooth 5122 can only rotate to a limited extent, thereby better preventing the motor shaft 3 from rotating 360° around the circumference of the motor shaft 3 relative to the housing 1 under the action of external force.
[0148] The number of the aforementioned stop teeth 5122 and the number of stop grooves 14 can be as follows: Figure 4 The four shown are not limited to the number of the four teeth 5122 and the number of the grooves 14 shown. Of course, the number of the teeth 5122 and the number of the grooves 14 can be other possible values, such as two, three or five. This embodiment does not limit this.
[0149] In some embodiments, see Figure 4 and Figure 8 The housing 1 includes a first end cover 13 located at one end of the housing 1 along the axis of the motor shaft 3, and a retaining groove 14 is formed in the first end cover 13.
[0150] By forming the retaining groove 14 on the first end cap 13, the retaining groove 14 can be directly integrated onto the first end cap 13. In this way, there is no need to process a separate part to form the retaining groove 14. Instead, the retaining groove 14 is directly made on the first end cap 13. Therefore, the number of parts of the handle 100 can be reduced, the cost of the handle 100 can be reduced, and at the same time, the assembly process of the handle 100 can be simplified and the assembly efficiency of the handle 100 can be improved.
[0151] Of course, in other embodiments, it can also be formed on other components, and this embodiment does not limit this.
[0152] In some embodiments, see Figure 3 and Figure 4 The bearing module 2 also includes a second bearing assembly 22, which includes a second bearing outer sleeve 221 and a second sliding sleeve 222. The second sliding sleeve 222 is sleeved on the motor shaft 3, and the second bearing outer sleeve 221 is slidably sleeved on the second sliding sleeve 222 along the axis of the motor shaft 3.
[0153] The second bearing sleeve 221 and the first bearing sleeve 211 are spaced apart along the axis of the motor shaft 3. Specifically, when the motor 300 is applied to the handle 100, the second bearing sleeve 221 and the first bearing sleeve 211 can be located at both ends of the housing 1 along the axis of the motor shaft 3.
[0154] It should be noted that the structure of the second bearing assembly 22 can be the same as or similar to that of the first bearing assembly 21. For details, please refer to the description of the first bearing assembly 21 in the above embodiments. This embodiment will not repeat the description here.
[0155] Since the second bearing sleeve 221 and the first bearing sleeve 211 are located at both ends of the housing 1 along the axis of the motor shaft 3, the first bearing assembly 21 and the second bearing assembly 22 can support the motor shaft 3 from both ends of the housing 1. Therefore, the motor shaft 3 can move back and forth along the axis of the motor shaft 3 or rotate around the axis of the motor shaft 3 more smoothly, steadily and stably.
[0156] In some embodiments, see Figure 3 The limiting module 5 also includes a second limiting component 52, which is used to prevent the second sliding sleeve 222 from coming off the second bearing outer sleeve 221 along the axis of the motor shaft 3.
[0157] By setting the second limiting component 52, the second sliding sleeve 222 can be prevented from dislodging from the second bearing outer sleeve 221 along the axis of the motor shaft 3. In this way, the supporting effect of the structure jointly constructed by the second bearing outer sleeve 221 and the second sliding sleeve 222 on the motor shaft 3 can be avoided. As a result, when the drive module 4 drives the motor shaft 3 to move back and forth along the axis of the motor shaft 3, the reciprocating movement of the motor shaft 3 is relatively smooth and there will be no jamming, which makes the brushing experience of the electric toothbrush better.
[0158] The structure of the second limiting component 52 can be the same as or similar to that of the first limiting component 51 described above. For details, please refer to the description of the first limiting component 51 in the above embodiments. This embodiment will not repeat the description here.
[0159] In some embodiments, see Figure 2A , Figure 3 and Figure 10 , Figure 10 This is a schematic diagram of the structure when the first bearing assembly 21 and the second bearing assembly 22 are installed on the motor shaft 3. The motor shaft 3 includes a first shaft section 31 and a second shaft section 32. A first sliding sleeve 212 is fitted onto the first shaft section 31, and the second shaft section 32 is used to connect with the brush head 200. The diameter of the first shaft section 31 is larger than the diameter of the second shaft section 32.
[0160] Since the diameter of the first shaft segment 31 is larger than the diameter of the second shaft segment 32, the motor shaft 3 will be a stepped shaft.
[0161] When the motor shaft 3 is a stepped shaft and the diameter of the first shaft segment 31 is larger than the diameter of the second shaft segment 32, if the accuracy of the first shaft segment 31 is found to be insufficient during the installation of the first bearing assembly 21 and the second bearing assembly 22 on the first shaft segment 31, the diameter of the first shaft segment 31 will not become too small after fine grinding of the first shaft segment 31, thereby ensuring that the mechanical strength of the motor shaft 3 formed by the first shaft segment 31 and the second shaft segment 32 is strong.
[0162] In the process of manufacturing the motor shaft 3, the motor shaft 3 can first be electroplated. Then, if it is found that the precision of the first shaft section 31 does not meet the precision requirements, only the first shaft section 31 can be finely ground, and the second shaft section 32 can be left unpolished. In this way, the installation precision of the first bearing assembly 21 and the second bearing assembly 22 on the first shaft section 31 can be guaranteed, while the salt spray resistance of the second shaft section 32 can be guaranteed.
[0163] The diameter of the first shaft segment 31 can be 3.1 mm, and the diameter of the second shaft segment 32 can be 3 mm. Of course, the diameters of the first shaft segment 31 and the second shaft segment 32 can also be other possible values, which are not limited in this embodiment.
[0164] An embodiment of this application also provides a handle 100, see [link to relevant documentation] Figure 2A and Figure 3 The handle 100 includes a housing 1 and a motor 300. The housing 1 has an extension hole 12 that communicates with the inner cavity of the housing. The bearing module 2, the drive module 4, and the limiting module 5 are all located in the inner cavity. The first bearing sleeve 211 is fixed in the inner cavity and extends along the axis of the motor shaft 3. At least a portion of the motor shaft 3 extends out of the housing 1 through the extension hole 12 for connection with the brush head 200.
[0165] The structure of the motor 300 can be the same as that of any of the motors 300 described in the above embodiments, and can bring the same or similar beneficial effects. For details, please refer to the description of the motor 300 in the above embodiments. This embodiment will not repeat the description here.
[0166] In this embodiment, since the motor 300 can prevent the motor shaft 3 from jamming when it moves back and forth along the axis of the motor shaft 3, the user experience of the handle 100 can be improved when the handle 100 includes the motor 300.
[0167] An embodiment of this application also provides an electric toothbrush 1000, see [link]. Figure 7 The electric toothbrush 1000 includes a handle 100 and a brush head 200, the brush head 200 being connected to the motor shaft 3.
[0168] The structure of the handle 100 can be the same as that of any of the handles 100 in the above embodiments, and can bring the same or similar beneficial effects. For details, please refer to any of the handles 100 described in the above embodiments. This embodiment will not be described again here.
[0169] In this embodiment, since the handle 100 makes the reciprocating movement of the motor shaft 3 smooth and prevents jamming, the electric toothbrush 1000 includes the handle 100, which makes the brushing experience of the electric toothbrush 1000 better.
[0170] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. An electric motor, characterized in that, include: Motor shaft; The bearing module includes a first bearing assembly, which includes a first bearing outer sleeve and a first sliding sleeve. The first sliding sleeve is sleeved on the motor shaft, and the first bearing outer sleeve is slidably sleeved on the first sliding sleeve along the axis of the motor shaft. A drive module, the drive module being used to drive the motor shaft to reciprocate along the axis of the motor shaft; and, The limiting module includes a first limiting component for preventing the first sliding sleeve from dislodging from the first bearing outer sleeve along the axis of the motor shaft.
2. The motor according to claim 1, characterized in that, The first limiting component is located on both sides of the first bearing sleeve along the axis of the motor shaft, and is used to prevent the first sliding sleeve from dislodging from the first bearing sleeve along the axis of the motor shaft from both sides of the first bearing sleeve.
3. The motor according to claim 2, characterized in that, The first sliding sleeve is provided with balls, and the first limiting component is used to prevent the balls from coming out of the first bearing sleeve along the axis of the motor shaft from both sides of the first bearing sleeve.
4. The motor according to claim 1, characterized in that, The first limiting component includes: The first limiting member has a first baffle wall located on the first side of the first bearing outer sleeve along the axis of the motor shaft. The first baffle wall and the first bearing outer sleeve are spaced apart along the axis of the motor shaft. The length of the first sliding sleeve along the axis of the motor shaft is H1, and the distance between the first baffle wall and the first bearing outer sleeve is H2. The first baffle wall is used to prevent the first sliding sleeve from dislodging from the first side of the first bearing outer sleeve along the axis of the motor shaft.
5. The motor according to claim 4, characterized in that, The first retaining wall is provided with a countersunk hole extending along the axis of the motor shaft. The diameter of the countersunk hole is larger than the inner diameter of the first sliding sleeve and smaller than the outer diameter of the first sliding sleeve.
6. The motor according to claim 4, characterized in that, The first barrier is formed within the housing of the handle of the electric toothbrush, the housing including a first end cap located at one end of the housing along the axis of the motor shaft, the first barrier being formed in the first end cap.
7. The motor according to claim 1, characterized in that, The first limiting component also includes: The second limiting member is sleeved on the motor shaft. The second limiting member has a second retaining wall located on the second side of the first bearing outer sleeve along the axis of the motor shaft. The second retaining wall is used to prevent the first sliding sleeve from dislodging from the second side of the first bearing outer sleeve along the axis of the motor shaft.
8. The motor according to claim 7, characterized in that, The second retaining wall has a convex ring surrounding the motor shaft on the side facing the first sliding sleeve, and the outer diameter of the convex ring is larger than the inner diameter of the first sliding sleeve.
9. The motor according to claim 8, characterized in that, During the reciprocating movement of the second limiting member along the axis of the motor shaft, the maximum distance H3 between the convex ring and the first bearing outer sleeve is less than the length H1 of the first sliding sleeve along the axis of the motor shaft.
10. The motor according to claim 7, characterized in that, The second limiting member is provided with a sound-absorbing pad.
11. The motor according to claim 10, characterized in that, The second retaining wall has a convex ring surrounding the motor shaft on the side facing the first sliding sleeve. The noise-absorbing pad surrounds the convex ring, and the convex ring protrudes from the noise-absorbing pad along the axis of the motor shaft.
12. The motor according to claim 7, characterized in that, The second limiting member is used to be installed inside the housing of the handle of the electric toothbrush. The drive module is also used to drive the motor shaft to rotate around the axis of the motor shaft. The first sliding sleeve is also rotatably inserted into the first bearing sleeve around the axis of the motor shaft. The second limiting member has a set of stop teeth arranged circumferentially along the motor shaft, and the housing has a stop groove corresponding to the stop teeth, with the stop teeth located in the stop groove; Along the circumferential direction of the motor shaft, the size of the retaining tooth is smaller than the size of the retaining groove.
13. The motor according to claim 12, characterized in that, The number of the blocking teeth and the number of the blocking grooves are both multiple, and the multiple blocking teeth correspond one-to-one with the multiple blocking grooves.
14. The motor according to claim 12, characterized in that, The housing includes a first end cap located at one end of the housing along the axis of the motor shaft, and the retaining groove is formed in the first end cap.
15. The motor according to any one of claims 1-14, characterized in that, The bearing module also includes: The second bearing assembly includes a second bearing outer sleeve and a second sliding sleeve. The second sliding sleeve is sleeved on the motor shaft, and the second bearing outer sleeve is slidably sleeved on the second sliding sleeve along the axis of the motor shaft. The second bearing outer sleeve and the first bearing outer sleeve are spaced apart along the axis of the motor shaft.
16. The motor according to any one of claims 1-14, characterized in that, The motor shaft includes a first shaft segment and a second shaft segment, the first sliding sleeve is sleeved on the first shaft segment, and the second shaft segment is used to connect with the brush head; The diameter of the first shaft segment is larger than the diameter of the second shaft segment.
17. A handle, characterized in that, include: A housing, wherein the housing is provided with an extension hole communicating with the inner cavity of the housing; as well as, The motor according to any one of claims 1-16, wherein the bearing module, the drive module and the limiting module are all located in the inner cavity, the first bearing sleeve is fixedly disposed in the inner cavity and extends along the axis of the motor shaft, and at least a portion of the motor shaft extends out of the housing through the protrusion hole for connection with the brush head.
18. An electric toothbrush, characterized in that, include: The handle as claimed in claim 17; A brush head, which is connected to the motor shaft.